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#pragma once
#include "coding/geometry_coding.hpp"
#include "geometry/point2d.hpp"
#include "std/cstdint.hpp"
#include "std/unique_ptr.hpp"
#include "std/vector.hpp"
class FilesContainerR;
class Reader;
class Writer;
namespace search
{
// A wrapper class around serialized centers-table.
//
// *NOTE* This wrapper is abstract enough so feel free to change it,
// but note that there should always be backward-compatibility. Thus,
// when adding new versions, never change data format of old versions.
//
// All centers tables are serialized in the following format:
//
// File offset (bytes) Field name Field size (bytes)
// 0 version 2
// 2 endianness 2
//
// Version and endianness is always in stored little-endian format. 0
// value of endianness means little endian, whereas 1 means big
// endian.
class CentersTable
{
public:
struct Header
{
void Read(Reader & reader);
void Write(Writer & writer);
bool IsValid() const;
uint16_t m_version = 0;
uint16_t m_endianness = 0;
};
static_assert(sizeof(Header) == 4, "Wrong header size");
virtual ~CentersTable() = default;
// Tries to get |center| of the feature identified by |id|. Returns
// false if table does not have entry for the feature.
WARN_UNUSED_RESULT virtual bool Get(uint32_t id, m2::PointD & center) = 0;
// Loads CentersTable instance. Note that |reader| must be alive
// until the destruction of loaded table. Returns nullptr if
// CentersTable can't be loaded.
static unique_ptr<CentersTable> Load(Reader & reader,
serial::GeometryCodingParams const & codingParams);
private:
virtual bool Init() = 0;
};
class CentersTableBuilder
{
public:
inline void SetGeometryCodingParams(serial::GeometryCodingParams const & codingParams)
{
m_codingParams = codingParams;
}
void Put(uint32_t featureId, m2::PointD const & center);
void Freeze(Writer & writer) const;
private:
serial::GeometryCodingParams m_codingParams;
vector<m2::PointU> m_centers;
vector<uint32_t> m_ids;
};
} // namespace search
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